Apple Seeds Second Beta of macOS Sierra 10.12.5 to Developers - MacRumors
Skip to Content

Apple Seeds Second Beta of macOS Sierra 10.12.5 to Developers

Apple today seeded the second beta of an upcoming macOS Sierra 10.12.5 update to developers, nearly two weeks after seeding the first beta and two weeks after releasing macOS Sierra 10.12.4, which introduced Night Shift for the Mac.

macOS Sierra 10.12.5 can be downloaded through the Apple Developer Center or through the Software Update mechanism in the Mac App Store.

macOS 10
According to the release notes accompanying the beta, the update "improves the stability, compatibility, and security of your Mac."

Because Apple's release notes don't often provide much insight into what's included in new beta software, we don't yet know what features or bug fixes might be included in 10.12.5.

Nothing notable was discovered in the first beta, but should new features be discovered in the second macOS Sierra 10.12.5 beta, we'll update this post.

Related Forum: macOS Sierra

Popular Stories

apple pro tell logo

Apple Launching Five New Products This Friday

Monday November 2, 2026 1:22 am PST by
Apple is releasing five new products this Friday, November 6, following pre-orders that opened last week, including its first touchscreen MacBook Pro models. The following new products will be available from Friday: iPad mini with OLED display and A20 Pro chip iMac with M6 chip 14-inch MacBook Pro with M6 chip 14-inch MacBook Pro with OLED touchscreen 16-inch MacBook Pro with OLED...
Apple Logo Gradient 16x9 1

Apple Isn't Done With 2026: Here's What's Still Coming

Monday November 2, 2026 7:27 am PST by
Apple's busiest season isn't over yet. Far from it. With two hardware launch dates still to come in November, plus software updates and new smart home accessories running into December, there's more on the way from Apple before the end of 2026, so be sure to stick around. Below, we've rounded up what's still coming, along with one date in particular that's worth watching if you're a holiday...
iPad Pro 2024 vs Air 2024 Feature

Three New iPads Rumored to Launch in First Half of 2027

Sunday November 1, 2026 7:27 am PST by
After announcing a new iPad mini with an OLED display earlier this month, Apple plans to release new iPad Air, iPad Pro, and entry-level iPad models in the first half of 2027, according to the latest word from Bloomberg's Mark Gurman. In his Power On newsletter today, Gurman said the next iPad Air will also feature an OLED display, while he expects the next iPad Pro to be equipped with a...

Top Rated Comments

125 months ago
It would be reallyyyy nice if they could release a detailed change-log for once other than "this update improves stability" bla bla so we know what to expect or what to look out for..
Score: 14 Votes (Like | Disagree)
cult hero Avatar
125 months ago
10.12.4 was a big deal for me. A lot of issues I've had with the Touch Bar and Thunderbolt 3 appears to have gone away. I had griped that the 2016 MBP was the most unstable Mac I have owned since the switch to Intel (that was pretty bumpy early on) each new release of Sierra, 10.12.4 in particular, has improved things.

* No more randomly vanishing portions of the Touch Bar. (I was starting to think I had bad hardware.)
* No more sleep/way system crashes while connected to Thunderbolt 2 or 3 devices.
* Far less application crashing.

As others have stated, I wish they would be more detailed in their release notes.
Score: 9 Votes (Like | Disagree)
125 months ago
It would be reallyyyy nice if they could release a detailed change-log for once other than "this update improves stability" bla bla so we know what to expect or what to look out for..
I agree, that's one of the reasons why I love the team running Safari Technology Preview, they do great release notes. I wish Apple'd do the same for all of their releases.
Score: 9 Votes (Like | Disagree)
125 months ago
It would be reallyyyy nice if they could release a detailed change-log for once other than "this update improves stability" bla bla so we know what to expect or what to look out for..
Exactly, we don't need any security info but they need to be more transparent on what the specific fixes would be. I mean Apple fixing a bug or glitch is a good thing why hide it under a general broad statement, be more specific and transparent.
Score: 4 Votes (Like | Disagree)
justperry Avatar
125 months ago
No, at least not for me - Retina 4K iMac and the latest macOS update VASTLY improved the overall speed and snappiness of the OS.

iOS no difference, which is a good thing as it runs beautifully as is on my iPad Mini 4.

That's what betas and reviewer testing's for - reviewers who download the latest and report in. But I get where you're coming from, sometimes it is a bit iffy not knowing what will and won't be improved etc.
This, and iOS flies since the new file System.:)
Score: 3 Votes (Like | Disagree)
gsmornot Avatar
125 months ago
Exactly, we don't need any security info but they need to be more transparent on what the specific fixes would be. I mean Apple fixing a bug or glitch is a good thing why hide it under a general broad statement, be more specific and transparent.
I would like this with all updates including app updates. So often they say bug fixes and thats all.
Score: 3 Votes (Like | Disagree)
Latest Stories
Everything New in the iOS 27.3 Beta
Everything New in the iOS 27.3 Beta
8 hours ago
Apple Music's New Selfie Sing Feature Lets You Record Karaoke Videos
Apple Music's New Selfie Sing Feature Lets You Record Karaoke Videos
9 hours ago
iPhone Jailbreak Gets Past Lockdown Mode and Survives an Update
iPhone Jailbreak Gets Past Lockdown Mode and Survives an Update
10 hours ago
iPadOS 27.3 Expands Siri Mode to Camera App
iPadOS 27.3 Expands Siri Mode to Camera App
12 hours ago
Veterans Day Apple Watch Activity Challenge Launches November 11
Veterans Day Apple Watch Activity Challenge Launches November 11
12 hours ago
Best Early Black Friday Mac Deals: Save Hundreds on MacBook Air, Mac Mini, and More
Best Early Black Friday Mac Deals: Save Hundreds on MacBook Air, Mac Mini, and More
13 hours ago
Apple Fitness+ Gets Gym Strength Plans in iOS 27.3
Apple Fitness+ Gets Gym Strength Plans in iOS 27.3
13 hours ago
iOS 27.3 Adding New StandBy Mode Features to iPhone 11 and Newer
iOS 27.3 Adding New StandBy Mode Features to iPhone 11 and Newer
13 hours ago
Apple Releases New AirPods Beta Firmware
Apple Releases New AirPods Beta Firmware
13 hours ago
iOS 27.3 Beta Brings Apple Intelligence to China
iOS 27.3 Beta Brings Apple Intelligence to China
13 hours ago
iPhone Duo Gets Reachability in iOS 27.3 Beta
iPhone Duo Gets Reachability in iOS 27.3 Beta
13 hours ago
Siri AI Gets More Capable in iOS 27.3
Siri AI Gets More Capable in iOS 27.3
14 hours ago
iOS 27.3 Adds Vertical Tabs and Adaptive Dark Mode to Safari
iOS 27.3 Adds Vertical Tabs and Adaptive Dark Mode to Safari
14 hours ago
watchOS 27.3 Brings Live Rewind and Siri Recap to Apple Watch
watchOS 27.3 Brings Live Rewind and Siri Recap to Apple Watch
14 hours ago
iOS 27.3 Beta Brings Back Apple's Redesigned Health App
iOS 27.3 Beta Brings Back Apple's Redesigned Health App
14 hours ago
Apple Releases First macOS Golden Gate 27.3 Beta
Apple Releases First macOS Golden Gate 27.3 Beta
15 hours ago
Apple Seeds First iOS 27.3 Beta
Apple Seeds First iOS 27.3 Beta
15 hours ago
Apple Releases First watchOS 27.3, tvOS 27.3 and visionOS 27.3 Betas
Apple Releases First watchOS 27.3, tvOS 27.3 and visionOS 27.3 Betas
15 hours ago
iPad Mini 8 Reviewer Dissatisfied With Apple's Excuse for Lack of 120Hz Display
iPad Mini 8 Reviewer Dissatisfied With Apple's Excuse for Lack of 120Hz Display
15 hours ago
iPad Mini 8 Review Claims Battery Life is Way Better Than Apple Says
iPad Mini 8 Review Claims Battery Life is Way Better Than Apple Says
15 hours ago
B&H Photo Launches Early Black Friday Sale With Discounts on Macs and Accessories
B&H Photo Launches Early Black Friday Sale With Discounts on Macs and Accessories
16 hours ago
iPhone Duo Could Take Nearly 30% of Foldable Market in 2027
iPhone Duo Could Take Nearly 30% of Foldable Market in 2027
16 hours ago
Apple Watch Automatically Identifies Songs Playing Around You
Apple Watch Automatically Identifies Songs Playing Around You
17 hours ago
iPhone 18 Rumored to Get Larger Battery and Potential Price Increase
iPhone 18 Rumored to Get Larger Battery and Potential Price Increase
17 hours ago
Apple Store in UK Permanently Closing Later This Month
Apple Store in UK Permanently Closing Later This Month
17 hours ago
Apple's Annual R&D Spending Jumps by More Than $11 Billion
Apple's Annual R&D Spending Jumps by More Than $11 Billion
18 hours ago
Will Apple Ever Merge iPadOS and macOS? John Ternus Responds
Will Apple Ever Merge iPadOS and macOS? John Ternus Responds
18 hours ago
MacBook Neo Gets Rare $30 Amazon Discount
MacBook Neo Gets Rare $30 Amazon Discount
18 hours ago
Hands-On: The OLED iPad Mini is Almost an iPad Pro Mini
Hands-On: The OLED iPad Mini is Almost an iPad Pro Mini
19 hours ago
tvOS 27.2.1 and macOS 27.2.1 Likely Coming Soon
tvOS 27.2.1 and macOS 27.2.1 Likely Coming Soon
19 hours ago